<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        #parent{
            width: 200px;
            height: 200px;
            background-color: aqua;
        }
        #child{
            width: 50px;
            height: 50px;
            background-color: black;
        }
    </style>
</head>
<body>
    <div id="parent">
        <div id="child"></div>
    </div>
</body>
</html>
<script>
    document.onkeydown = function(e){
        console.log(e.keyCode);
    }
</script>